APA (7th ed.) Citation

Empson, W. (1966). Seven types of ambiguity ([3d ed.].). New Directions.

Chicago Style (17th ed.) Citation

Empson, William. Seven Types of Ambiguity. [3d ed.]. New York: New Directions, 1966.

MLA (9th ed.) Citation

Empson, William. Seven Types of Ambiguity. [3d ed.]. New Directions, 1966.